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Define SIZE_OF_LONG_INT to replace sizeof(long) in #if #1636

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Define SIZE_OF_LONG_INT to replace sizeof(long) in #if #1636

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a181adc
Define SIZE_OF_LONG_INT to replace sizeof(long) in #if
davidBar-On Jan 20, 2024
1ccc06f
Change printf() %d to %zd per review per comment
davidBar-On Feb 16, 2024
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10 changes: 10 additions & 0 deletions configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -180,6 +180,16 @@ else
fi
fi

# Get the size of long int
AC_CACHE_CHECK([Size of long int],
[iperf3_cv_sizeof_long],
AC_RUN_IFELSE(
[AC_LANG_PROGRAM([[#include <stdio.h>]],
[[fprintf(stderr, "%d", sizeof(long)); return(0)]])],
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Thanks for the pull request! I got a compiler warning with macOS / Clang on this line (line 188) where it complained of a mismatch between the %d format specifier (which takes an int) and sizeof(long), which is a long. If I changed the %d to %zd then this seems to work correctly.

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That's all kinda pointless.
<inttypes.h> is in c99, c99 is supported everywhere (that's why issue gone unnoticed for 10 years), and "%zd" is from c99 too. Besides, AC_RUN_IFELSE breaks on cross-compilation (you need check that fails on compilation stage), etc.
Just use `<inttypes.h>' unconditionally and be done.

[iperf3_cv_sizeof_long=`./conftest$EXEEXT 2>&1`],
[AC_MSG_ERROR(Failed to compile and run size of long test)]))
AC_DEFINE_UNQUOTED([SIZE_OF_LONG_INT], $iperf3_cv_sizeof_long, [Size of long int.])

# Check for TCP_CONGESTION sockopt (believed to be Linux and FreeBSD only)
AC_CACHE_CHECK([TCP_CONGESTION socket option],
[iperf3_cv_header_tcp_congestion],
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4 changes: 2 additions & 2 deletions src/cjson.c
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Expand Up @@ -94,13 +94,13 @@
# include <inttypes.h>
#else
# ifndef PRIu64
# if sizeof(long) == 8
# if SIZE_OF_LONG_INT == 8
# define PRIu64 "lu"
# else
# define PRIu64 "llu"
# endif
# ifndef PRId64
# if sizeof(long) == 8
# if SIZE_OF_LONG_INT == 8
# define PRId64 "ld"
# else
# define PRId64 "lld"
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2 changes: 1 addition & 1 deletion src/iperf.h
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Expand Up @@ -55,7 +55,7 @@
# include <inttypes.h>
#else
# ifndef PRIu64
# if sizeof(long) == 8
# if SIZE_OF_LONG_INT == 8
# define PRIu64 "lu"
# else
# define PRIu64 "llu"
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2 changes: 1 addition & 1 deletion src/iperf_locale.c
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Expand Up @@ -85,7 +85,7 @@
# include <inttypes.h>
#else
# ifndef PRId64
# if sizeof(long) == 8
# if SIZE_OF_LONG_INT == 8
# define PRId64 "ld"
# else
# define PRId64 "lld"
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2 changes: 1 addition & 1 deletion src/iperf_udp.c
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Expand Up @@ -52,7 +52,7 @@
# include <inttypes.h>
#else
# ifndef PRIu64
# if sizeof(long) == 8
# if SIZE_OF_LONG_INT == 8
# define PRIu64 "lu"
# else
# define PRIu64 "llu"
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