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- Log -----------------------------------------------------------------
commit 8a6b028ace641df4458f575f93c4fa48ec98499c
Merge: 4d76de5 6f24b10
Author: Peter Simons <address@hidden>
Date:   Sat Oct 1 19:40:32 2016 +0200

    Merge pull request #96 from smcv/compiler-flags-inf-recursion
    
    ax_compiler_flags_*: fix underquoting causing infinite recursion

commit 6f24b1094fd88e7960ef0558527a650da79988af
Author: Simon McVittie <address@hidden>
Date:   Sat Oct 1 14:46:24 2016 +0100

    ax_compiler_flags_*: fix underquoting causing infinite recursion
    
    These macros would fail with infinite recursion if used twice for the
    same variable, for example
    
        AX_COMPILER_FLAGS_CFLAGS([WARN_CFLAGS], ... some options ...)
        AX_COMPILER_FLAGS_CFLAGS([WARN_CFLAGS], ... more options ...)
    
    In particular, invoking AX_COMPILER_FLAGS, followed by
    AX_COMPILER_FLAGS_CFLAGS with more "yes" options has this failure mode.
    
    This is because the first time through the macro, we define
    ax_warn_cflags_variable = "WARN_CFLAGS" as expected. The second time,
    because the first parameter is underquoted, its value is substituted
    before calling m4_define, so we inadvertently define
    WARN_CFLAGS = "WARN_CFLAGS". The next time WARN_CFLAGS is mentioned,
    attempts to expand it will recurse forever, because m4 does not
    special-case a macro that appears in its own expansion like cpp does.
    
    Signed-off-by: Simon McVittie <address@hidden>

-----------------------------------------------------------------------

Summary of changes:
 m4/ax_compiler_flags_cflags.m4   |    4 ++--
 m4/ax_compiler_flags_cxxflags.m4 |    4 ++--
 m4/ax_compiler_flags_gir.m4      |    4 ++--
 m4/ax_compiler_flags_ldflags.m4  |    4 ++--
 4 files changed, 8 insertions(+), 8 deletions(-)


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