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# Software notes
This document lists some software known to build successfully, and any
special procedures necessary.
## sbase
Builds without issue with musl. On glibc, there are some errors due to
the declaration of `strsep` conflicting with the system declaration in
usage of `restrict` (see [#50]). This can be resolved with the diff below.
```diff
diff --git a/util.h b/util.h
index 6c0aba9..9b6022c 100644
--- a/util.h
+++ b/util.h
@@ -57,6 +57,7 @@ size_t strlcpy(char *, const char *, size_t);
size_t estrlcpy(char *, const char *, size_t);
#undef strsep
+#define strsep xstrsep
char *strsep(char **, const char *);
/* regex */
```
[#50]: https://todo.sr.ht/~mcf/cc-issues/50
## mcpp
Builds without issue. Requires `CFLAGS=-D_POSIX_C_SOURCE=200112L`.
## binutils
On musl systems, you must define `long double` to match `double` (as
below) to avoid errors in unused `static inline` functions in musl's
`math.h`. Note: this is a hack and won't be ABI-incompatible with musl;
things will break if any functions with `long double` get called.
```diff
-struct type typeldouble = FLTTYPE(TYPELDOUBLE, 16, NULL); // XXX: not supported by qbe
+struct type typeldouble = FLTTYPE(TYPELDOUBLE, 8, &f64);
```
Requires several patches available here:
https://github.com/michaelforney/binutils-gdb/
- Fix function pointer subtraction in `bfd/doc/chew.c` (applied upstream).
- Skip unsupported `LDFLAGS`, only tested to work against `CXX` by
configure, but applied to `CC` as well.
- Disable `long double` support in `_bfd_doprnt`.
- Alter some ifdefs to avoid statement expressions and VLAs.
- Implement `pex_unix_exec_child` with `posix_spawn` instead of `vfork`
and subtle `volatile` usage.
- Make `regcomp` and `regexec` match the header declaration in usage of
`restrict`.
- Don't declare `vasprintf` unless it was checked for and not
found (applied to libiberty upstream).
- Make sure `config.h` is included in `arlex.c` so that the appropriate
feature-test macros get defined to expose `strdup`.
Configure with
```
./configure CFLAGS_FOR_BUILD=-D_GNU_SOURCE \
--disable-intl --disable-gdb --disable-plugins --disable-readline
```
[f6a7d135]: https://git.sr.ht/~mcf/qbe/commit/f6a7d135d54f5281547f20cc4f72a5e85862157c
## gcc 4.7
Requires a number patches available here:
https://github.com/michaelforney/gcc/tree/gcc-4_7-branch
Also requires gmp headers modified for C99 inline semantics:
https://hg.sr.ht/~mcf/gmp-6.1/rev/53195faa26dfeafeacd57f54035373988e2a16a3
Build with
```
git clone -b gcc-4_7-branch https://github.com/michaelforney/gcc
cd gcc
hg clone https://hg.sr.ht/~mcf/gmp-6.1 gmp
(cd gmp && aux_dir=. ltdl_dir=. ./.bootstrap)
./configure --disable-multilib --disable-bootstrap --disable-lto --enable-languages=c,c++
make
```
## zstd
Requires disabling CPU identification inline assembly and deprecation
warnings.
```diff
diff --git a/lib/common/cpu.h b/lib/common/cpu.h
index 5f0923fc..10dd7d7f 100644
--- a/lib/common/cpu.h
+++ b/lib/common/cpu.h
@@ -52,6 +52,7 @@ MEM_STATIC ZSTD_cpuid_t ZSTD_cpuid(void) {
f7c = (U32)reg[2];
}
}
+#elif 1
#elif defined(__i386__) && defined(__PIC__) && !defined(__clang__) && defined(__GNUC__)
/* The following block like the normal cpuid branch below, but gcc
* reserves ebx for use of its pic register so we must specially
```
Build with
make CC=/path/to/cc CFLAGS='-DZDICT_DISABLE_DEPRECATE_WARNINGS -DZBUFF_DISABLE_DEPRECATE_WARNINGS' zstd
Some tests fail, which still need to be investigated.
## st
Requires a few changes to avoid wide string literals and including
`math.h` on musl targets.
```diff
diff --git a/config.def.h b/config.def.h
index 482901e..bd963ae 100644
--- a/config.def.h
+++ b/config.def.h
@@ -32,7 +32,7 @@ static float chscale = 1.0;
*
* More advanced example: L" `'\"()[]{}"
*/
-wchar_t *worddelimiters = L" ";
+wchar_t *worddelimiters = (wchar_t[]){' ', 0};
/* selection timeouts (in milliseconds) */
static unsigned int doubleclicktimeout = 300;
diff --git a/x.c b/x.c
index 5828a3b..6e006cc 100644
--- a/x.c
+++ b/x.c
@@ -1,6 +1,5 @@
/* See LICENSE for license details. */
#include <errno.h>
-#include <math.h>
#include <limits.h>
#include <locale.h>
#include <signal.h>
@@ -15,6 +14,8 @@
#include <X11/Xft/Xft.h>
#include <X11/XKBlib.h>
+float ceilf(float);
+
static char *argv0;
#include "arg.h"
#include "st.h"
```
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