glibc.git/Makeconfig, branch master

Build glibc with -ftrapping-math

2025-10-20T14:33:54+00:00

GCC enables it by default, clang in the other hand sets -fno-trapping-math.
This is required to fix some math and stdlib tests that explicit raises
floating point exceptions:

math/test-double-canonicalize.out
testing double (without inline functions)
Failure: canonicalize (max_value): Exception "Overflow" set
Failure: canonicalize (max_value): Exception "Inexact" set
Failure: canonicalize (-max_value): Exception "Overflow" set
Failure: canonicalize (-max_value): Exception "Inexact" set
Failure: canonicalize_downward (max_value): Exception "Overflow" set
Failure: canonicalize_downward (max_value): Exception "Inexact" set
Failure: canonicalize_downward (-max_value): Exception "Overflow" set
Failure: canonicalize_downward (-max_value): Exception "Inexact" set
Failure: canonicalize_towardzero (max_value): Exception "Overflow" set
Failure: canonicalize_towardzero (max_value): Exception "Inexact" set
Failure: canonicalize_towardzero (-max_value): Exception "Overflow" set
Failure: canonicalize_towardzero (-max_value): Exception "Inexact" set
Failure: canonicalize_upward (max_value): Exception "Overflow" set
Failure: canonicalize_upward (max_value): Exception "Inexact" set
Failure: canonicalize_upward (-max_value): Exception "Overflow" set
Failure: canonicalize_upward (-max_value): Exception "Inexact" set

test-float-catanh.out
testing float (without inline functions)
Failure: Real part of: catanh (-0x1.000002p+0 - 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh (-0x1.000002p+0 - 0x8p-152 i): Exception "Underflow" set
Failure: Real part of: catanh (-0x1.000002p+0 + 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh (-0x1.000002p+0 + 0x8p-152 i): Exception "Underflow" set
Failure: Real part of: catanh (-0xf.fffffp-4 - 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh (-0xf.fffffp-4 + 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh (0x1.000002p+0 - 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh (0x1.000002p+0 - 0x8p-152 i): Exception "Underflow" set
Failure: Real part of: catanh (0x1.000002p+0 + 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh (0x1.000002p+0 + 0x8p-152 i): Exception "Underflow" set
Failure: Real part of: catanh (0xf.fffffp-4 - 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh (0xf.fffffp-4 + 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_downward (-0x1.000002p+0 - 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_downward (-0x1.000002p+0 - 0x8p-152 i): Exception "Underflow" set
Failure: Real part of: catanh_downward (-0x1.000002p+0 + 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_downward (-0x1.000002p+0 + 0x8p-152 i): Exception "Underflow" set
Failure: Real part of: catanh_downward (-0xf.fffffp-4 - 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_downward (-0xf.fffffp-4 + 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_downward (0x1.000002p+0 - 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_downward (0x1.000002p+0 - 0x8p-152 i): Exception "Underflow" set
Failure: Real part of: catanh_downward (0x1.000002p+0 + 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_downward (0x1.000002p+0 + 0x8p-152 i): Exception "Underflow" set
Failure: Real part of: catanh_downward (0xf.fffffp-4 - 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_downward (0xf.fffffp-4 + 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_towardzero (-0x1.000002p+0 - 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_towardzero (-0x1.000002p+0 - 0x8p-152 i): Exception "Underflow" set
Failure: Real part of: catanh_towardzero (-0x1.000002p+0 + 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_towardzero (-0x1.000002p+0 + 0x8p-152 i): Exception "Underflow" set
Failure: Real part of: catanh_towardzero (-0xf.fffffp-4 - 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_towardzero (-0xf.fffffp-4 + 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_towardzero (0x1.000002p+0 - 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_towardzero (0x1.000002p+0 - 0x8p-152 i): Exception "Underflow" set
Failure: Real part of: catanh_towardzero (0x1.000002p+0 + 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_towardzero (0x1.000002p+0 + 0x8p-152 i): Exception "Underflow" set
Failure: Real part of: catanh_towardzero (0xf.fffffp-4 - 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_towardzero (0xf.fffffp-4 + 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_upward (-0x1.000002p+0 - 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_upward (-0x1.000002p+0 - 0x8p-152 i): Exception "Underflow" set
Failure: Real part of: catanh_upward (-0x1.000002p+0 + 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_upward (-0x1.000002p+0 + 0x8p-152 i): Exception "Underflow" set
Failure: Real part of: catanh_upward (-0xf.fffffp-4 - 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_upward (-0xf.fffffp-4 + 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_upward (0x1.000002p+0 - 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_upward (0x1.000002p+0 - 0x8p-152 i): Exception "Underflow" set
Failure: Real part of: catanh_upward (0x1.000002p+0 + 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_upward (0x1.000002p+0 + 0x8p-152 i): Exception "Underflow" set
Failure: Real part of: catanh_upward (0xf.fffffp-4 - 0x4p-128 i): Exception "Underflow" set
Failure: Real part of: catanh_upward (0xf.fffffp-4 + 0x4p-128 i): Exception "Underflow" set

Reviewed-by: H.J. Lu

Filter machine compiler flags into Assembler Flags

2025-08-07T07:02:17+00:00

Assembler files may want or need to test for predefined macros which are
set via -m* compiler options, so ensure all -m* options in CFLAGS are passed
to ASFLAGS.

Reviewed-by:  Florian Weimer

Makeconfig: The hash character # confuses old make, use $(dir instead of sed

2025-07-22T12:54:24+00:00

Up to Make 4.2, # is treated as the start of a comment even in
function invocations. This leads to a syntax error. Fixed in Make 4.3,
but we still support versions back to 4.0 at the moment.

Tested on Gentoo (x86-64) and Debian (loongarch64)

Signed-off-by: Andreas K. Hüttel 
Reviewed-by: Collin Funk

configure: Add --enable-sframe option

2025-07-14T09:57:53+00:00

Enable SFrame stack track information. The --enable-sframe option
allows the glibc build to compile with SFrame stack track
information. Thus, enabling glibc's backtrace to work within glibc.

Signed-off-by: Claudiu Zissulescu 
Reviewed-by: DJ Delorie 
Reviewed-by: Sam James

Makeconfig: Add libgcc directory to rtld-prefix search path

2025-07-09T13:45:46+00:00

* This needs to be done twice, for test runs with and without
  --enable-hardcoded-path-in-tests
* Also, we need to query the used $(CC) for the library location.

* The container tests run ldd and dump the list of needed libraries, then
  copy these into the container.
* Without this patch, ldd may not find libgcc_s.so, resulting in"not found"
  output and no copying of the library.
* With this patch, the library is picked up independent of its location (as
  long as the proper directory is provided) and copied into the testroot.

* This does not mean yet that ld.so in the testroot actually finds it.

Signed-off-by: Andreas K. Hüttel 
Reviewed-by: Adhemerval Zanella

Move C warning flags from +gccwarn to +gccwarn-c

2025-05-27T14:09:39+00:00

This avoids warnings about these options during the C++ header
inclusion tests.

Reviewed-by: Sam James

Turn on -Wmissing-parameter-name by default if available

2025-05-27T05:15:06+00:00

This flags another hazard for backporting changes to earlier branches.

Reviewed-by: Sam James

Turn on -Wfree-labels by default if available

2025-05-26T06:49:22+00:00

This flags a hazard for backporting changes to earlier branches.

Reviewed-by: Sam James

Makeconfig: Support $(+nolink-deps) in link flags

2025-03-21T20:40:28+00:00

This allows adding dependencies to rules, but not linking against
them.

This is more or less a reimplementation of .EXTRA_PREREQS feature from
GNU make 4.3.

Reviewed-by: Adhemerval Zanella

debug: Improve '%n' fortify detection (BZ 30932)

2025-03-21T18:46:48+00:00

The 7bb8045ec0 path made the '%n' fortify check ignore EMFILE errors
while trying to open /proc/self/maps, and this added a security
issue where EMFILE can be attacker-controlled thus making it
ineffective for some cases.

The EMFILE failure is reinstated but with a different error
message.  Also, to improve the false positive of the hardening for
the cases where no new files can be opened, the
_dl_readonly_area now uses  _dl_find_object to check if the
memory area is within a writable ELF segment.  The procfs method is
still used as fallback.

Checked on x86_64-linux-gnu and i686-linux-gnu.
Reviewed-by: Arjun Shankar