Re: Testing 2.16 release candidate with gnulib - quadratic behaviour detected in SSE42 strstr?

[Bruno Haible]

Carlos O'Donell wrote:
> (a) logf
> (b) log10f
> 
> Why wasn't -lm added to the link?
> 
> This looks like an environment/configuration issue with gnulib.
> 
> Adding `-lm' to CC fixes this, but that can't be right.
> 
> configure:84449: checking whether log10f works according to ISO C 99 with IEC 
> 60559
> configure:84504: gcc 
> -Wl,-rpath=/scratch/carloso/build4-lucid-cs/install//lib64:/scratch/carloso/build4-lucid-cs/install//usr/lib64
>  
> -Wl,--dynamic-linker=/scratch/carloso/build4-lucid-cs/install//lib64/ld-linux-x86-64.so.2
>  -std=gnu99 -o conftest -g -O2 -nostdinc 
> -I/usr/local/tools/gcc-4.3.3/lib/gcc/x86_64-unknown-linux-gnu/4.3.2/include-fixed
>  -I/scratch/carloso/build4-lucid-cs/install//usr/include 
> -I/usr/local/tools/gcc-4.3.3/lib/gcc/x86_64-unknown-linux-gnu/4.3.2/include 
> -Wall  conftest.c   >&5
> /tmp/cceWScoH.o: In function `main':
> /tmp/testdir/conftest.c:632: undefined reference to `log10f'
> collect2: ld returned 1 exit status
> configure:84508: $? = 1
> configure: program exited with status 1
> configure: failed program was:
> ...
> configure:84537: result: no

I can't see why LOGF_LIBM would have been empty. But for (b), it is a
consequence of (a) and a small bug in gnulib, which I'm fixing here.


2012-06-28  Bruno Haible  <address@hidden>

        log10f: Fix possible configuration problem.
        * m4/log10f.m4 (gl_FUNC_LOG10F): Augment LIBS by $LOG10F_LIBM, not
        $LOGF_LIBM.
        Reported by Carlos O'Donell <address@hidden>.

--- m4/log10f.m4.orig   Thu Jun 28 21:58:37 2012
+++ m4/log10f.m4        Thu Jun 28 21:58:15 2012
@@ -1,4 +1,4 @@
-# log10f.m4 serial 5
+# log10f.m4 serial 6
 dnl Copyright (C) 2011-2012 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -38,7 +38,7 @@
           [gl_cv_func_log10f_ieee],
           [
             save_LIBS="$LIBS"
-            LIBS="$LIBS $LOGF_LIBM"
+            LIBS="$LIBS $LOG10F_LIBM"
             AC_RUN_IFELSE(
               [AC_LANG_SOURCE([[
 #ifndef __NO_MATH_INLINES