From 99260d347b91f9f7ede335b7f582cee34ead2b0c Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Wed, 1 May 2024 14:23:20 -0400
Subject: build: Add some nice aliases to ./configure

---
 configure | 141 +++++++++++++++++++++++++++++++++++++++-----------------------
 1 file changed, 90 insertions(+), 51 deletions(-)

(limited to 'configure')

diff --git a/configure b/configure
index 830628a..d42dec3 100755
--- a/configure
+++ b/configure
@@ -7,75 +7,117 @@
 
 set -eu
 
-help() {
-    cat <<EOF
-Usage: $0 [-j<N>] [CC=...] [CFLAGS=...] [...]
+# Default to `make`
+MAKE="${MAKE:-make}"
 
-Compiler configuration:
+# Pass -j$(nproc) unless MAKEFLAGS is set
+if [ "${MAKEFLAGS+y}" ]; then
+    j=""
+else
+    j="-j$({ nproc || sysctl -n hw.ncpu || getconf _NPROCESSORS_ONLN || echo 1; } 2>/dev/null)"
+fi
+
+for arg; do
+    case "$arg" in
+        -h|--help)
+            cat <<EOF
+Usage:
+
+  \$ $0 [--enable-*|--disable-*] [CC=...] [CFLAGS=...] [...]
+  \$ $MAKE $j
+
+Variables set in the environment or on the command line will be picked up:
 
+  MAKE
+      The make implementation to use
   CC
       The C compiler to use
-  CPPFLAGS
-      C preprocessor flags
-  CFLAGS
-      C compiler flags
-  LDFLAGS
-      Linker flags
-  LDLIBS
+
+  CPPFLAGS="-I... -D..."
+  CFLAGS="-W... -f..."
+  LDFLAGS="-L... -Wl,..."
+      Preprocessor/compiler/linker flags
+
+  LDLIBS="-l... -l..."
       Dynamic libraries to link
 
-  EXTRA_CPPFLAGS
-  EXTRA_CFLAGS
-  EXTRA_LDFLAGS
-  EXTRA_LDLIBS
+  EXTRA_{CPPFLAGS,CFLAGS,LDFLAGS,LDLIBS}
       Adds to the default flags, instead of replacing them
 
-Build profiles:
+The default flags result in a plain debug build.  Other build profiles include:
 
-  RELEASE=y
+  --enable-release
       Enable optimizations, disable assertions
-  ASAN=y
-  LSAN=y
-  MSAN=y
-  TSAN=y
-  UBSAN=y
+  --enable-{asan,lsan,msan,tsan,ubsan}
       Enable sanitizers
-  GCOV=y
+  --enable-gcov
       Enable code coverage instrumentation
 
-External dependencies:
-
-  PKG_CONFIG
-      The pkg-config binary to use
+External dependencies are auto-detected by default, but you can --enable or
+--disable them manually:
 
-  USE_LIBACL=[y|n]
-  USE_LIBCAP=[y|n]
-  USE_LIBSELINUX=[y|n]
-  USE_LIBURIG=[y|n]
-  USE_ONIGURUMA=[y|n]
-      Enable or disable external dependencies
+  --enable-libacl      --disable-libacl
+  --enable-libcap      --disable-libcap
+  --enable-libselinux  --disable-libselinux
+  --enable-liburing    --disable-liburing
+  --enable-oniguruma   --disable-oniguruma
 
-Packaging configuration:
+Packaging:
 
-  PREFIX
+  --prefix=/path
       Set the installation prefix (default: /usr)
-  MANDIR
-      Set the man page directory (default: \$PREFIX/share/man)
-EOF
-}
 
-for arg; do
-    case "$arg" in
-        --help)
-            help
+This script is a thin wrapper around a makefile-based configuration system.
+Any other arguments will be passed directly to the $MAKE invocation, e.g.
+
+  \$ $0 $j V=1
+EOF
             exit 0
             ;;
+
+        --enable-*|--disable-*)
+            case "$arg" in
+                --enable-*) yn=y ;;
+                --disable-*) yn=n ;;
+            esac
+
+            name="${arg#--*able-}"
+            NAME=$(printf '%s' "$name" | tr 'a-z-' 'A-Z_')
+            case "$name" in
+                libacl|libcap|libselinux|liburing|oniguruma)
+                    shift
+                    set -- "$@" "USE_$NAME=$yn"
+                    ;;
+                release|asan|lsan|msan|tsan|ubsan|lint|gcov)
+                    shift
+                    set -- "$@" "$NAME=$yn"
+                    ;;
+                *)
+                    printf 'error: Unrecognized option "%s"\n\n' "$arg" >&2
+                    printf 'Run %s --help for more information.\n' "$0" >&2
+                    exit 1
+                    ;;
+            esac
+            ;;
+
+        --prefix=*)
+            shift
+            set -- "$@" "PREFIX=${arg#*=}"
+            ;;
+
+        MAKE=*)
+            MAKE="${arg#*=}"
+            shift
+            ;;
+
+        # make flag (-j2) or variable (CC=clang)
         -*|*=*)
-            continue # make flag (-j2) or variable (CC=clang)
+            continue
             ;;
+
         *)
             printf 'error: Unrecognized option "%s"\n\n' "$arg" >&2
-            help >&2
+            printf 'Run %s --help for more information.\n' "$0" >&2
             exit 1
             ;;
     esac
@@ -89,10 +131,7 @@ for f in Makefile build completions docs src tests; do
     test -e "$f" || ln -s "$DIR/$f" "$f"
 done
 
-# Infer -jN unless MAKEFLAGS is set
-j=
-if ! [ "${MAKEFLAGS+y}" ]; then
-    j="-j$({ nproc || sysctl -n hw.ncpu || getconf _NPROCESSORS_ONLN || echo 1; } 2>/dev/null)"
-fi
+# Set MAKEFLAGS to -j$(nproc) if it's unset
+export MAKEFLAGS="${MAKEFLAGS-$j}"
 
-${MAKE:-make} $j -rf build/config.mk "$@"
+$MAKE -rf build/config.mk "$@"
-- 
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